bluetooth: Add Device connection logic and accompanying user interface.

chrome/browser/resources/bluetooth_internals/device_collection.js

Index: chrome/browser/resources/bluetooth_internals/device_collection.js
diff --git a/chrome/browser/resources/bluetooth_internals/device_collection.js b/chrome/browser/resources/bluetooth_internals/device_collection.js
index 4d86d99c79d47e972aa809d210f54b8a59528384..ba352790cf138d80b4441c509527482bc3b16376 100644
--- a/chrome/browser/resources/bluetooth_internals/device_collection.js
+++ b/chrome/browser/resources/bluetooth_internals/device_collection.js
@@ -76,6 +76,44 @@ cr.define('device_collection', function() {
   var Device = function(info) {
     this.info = info;
     this.removed = false;
+    this.connectionPending = false;
+  };
+  Device.prototype = {
+    /**
+     * Creates a connection to the device and updates the service listing.
+     * @return {Promise} rejects if connection failed, resolves otherwise.
+     */
+    connect: function() {
+      this.connectionPending = true;
+      return adapter_broker.getAdapterBroker().then(function(broker) {
+        return broker.connectToDevice(this.info.address);
+      }.bind(this)).then(function(response) {
+        this.connectionPending = false;
+        if (response.error ==

[ortuno, 2016/11/08 04:38:02]

I would move this (if (response.error)... throw new Error(...);) to
AdapterBroker.

[mbrunson, 2016/11/08 22:45:12]

Done.

+            interfaces.BluetoothAdapter.ConnectResult.SUCCESS) {
+          this.proxy = response.device;
+          return this.proxy.getServices();
+        }
+
+        // TODO(mbrunson): Replace with more descriptive error messages.

[ortuno, 2016/11/08 04:38:02]

TODOs are usually used when there are other dependencies that need to be met in
order to fix an edge case or if the solution is too complex for this patch.
Either way, you should always point to an issue explaining the problem and, if
the former, block it on another issue. This way other contributors can
understand the context of the problem and submit a patch to fix it.

[mbrunson, 2016/11/08 22:45:12]

Ok. I'll make an issue. Done.

+        var errorString = Object.keys(
+            interfaces.BluetoothAdapter.ConnectResult)[response.error];
+
+        throw new Error(errorString);
+      }.bind(this)).then(function(response) {
+        this.info.services = response.services;
+      }.bind(this));
+    },
+
+    /**
+     * Disconnects a device and removes the Device interface proxy.
+     */
+    disconnect: function() {
+      if (this.proxy) {
+        this.proxy.disconnect();
+        this.proxy = null;
+      }
+    }
   };
 
   return {